#define MIN_HARDWARE_ENDSTOP_Z false -> true

#define MAX_FEEDRATE_X 400

#define JSON_OUTPUT 0

#define NUM_EXTRUDER 1

#define Z_PROBE_Z_OFFSET 0

Hello. schema nor any documentation does not. Likely Chinese clone Melzi 2.0. I have electro education. So I'm linking Measured, is in order. On board 5V it goes on the backlight on pins 15,16. brigh…

 #define  _SET_INPUT(IO)  do {DIO ##  IO ## _DDR &= ~MASK(DIO ## IO ## _PIN); } while (0)

 #define  _SET_INPUT(IO)  do {DIO ##  IO ## _DDR &= ~MASK(DIO ## IO ## _PIN); } while (0)

    #define DELTA_DRIVE_TYPE 0

#define TRY_AUTOREPAIR_LCD_ERRORS

you wrote#define Z_PROBE_X_OFFSET -50,49

#define Z_PROBE_Z_OFFSET 0

#define FEATURE_SAFETY_DOOR true

#define DRIVE_SYSTEM 3

#define X_HOME_DIR -1

#define ENDSTOP_PULLUP_X_MIN    true

#define RETRACTION_LENGTH 3                       

and the pin assigned to the #define ORIG_Y_MAX_PIN is a -1 which I am pretty sure is unassigned. 

#define ENDSTOP_Y_MAX_INVERTING   true

#define ENDSTOP_PULLUP_X_MIN    true